Oil pressure light began going on intermittently immediately after the car was repaired for a new Cam Chain Tightener, water pump, timing belt, and rebuilt Turbo. Fearful the engine might have sludge, I also had the mechanic drop the pan and clean the pick-up screen while he was doing everything else. Mechanic reported slight sludging when he tore into the engine.

Light goes on when under moderate load, and will cycle off if I shift to neutral and coast for a couple seconds.

Any ideas?
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